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Carb issues

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Carb issues

Post  MrTweedy on Fri Sep 25, 2015 12:52 pm

Hello all.

Looking for a bit of help with a problem I'm having with, what I think, is a S19 carb. It's fitted to a Villiers 6e engine but I believe it's not the correct carb for that engine. It has been working fine up 'til now so I'm not going to change it unless I have to.
The carb was overflowing with fuel but working OK apart from that so I decided to have it refurbished. Villiers Services did a fantastic job and were most helpful too but since I've re-fitted the carb, I've found it's still overflowing at the floatbowl but now the engine won't run unless the shutter on the air filter is fully closed. Any attempt to open the shutter results in the engine dying.
Til now I've only had experience with a simple 3/4 carb on my Merlin which has been no trouble.
Any help or pointers would be fantastic.

Regards

Matt



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carburettor

Post  piston 197 on Fri Sep 25, 2015 2:37 pm

Firstly a S19 if that is what it is , is too small for a 6E it is for the 147cc 30C engine and the 19 refers to millimetres ,the size of the hole through the carb body ( venturi)
A 6E should have a 24mm carb either the early medium weight brass carb or the aluminium bodied S24, ( although an S25 will do if you fit the 8E manifold.)
If it will only run with the air strangler closed it is too weak, i.e the central needle in the middle of the slide is protruding too far and cutting fuel supply. the amount protruding for the S24/25 carb is 1.950", but as I do not know what carb you actually have I cannot say whether this will be of any use to you ?
JH
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Thanks JH

Post  MrTweedy on Fri Sep 25, 2015 3:17 pm

Perhaps I should post a photo, that might help.

Matt
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carburettor

Post  piston 197 on Fri Sep 25, 2015 4:14 pm

Perhaps you should measure the hole size through the carburettor, a S19 is 19mm ( 3/4")
Can't see how one of these can be made to fit a 6E, but you never know .
JH
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Re: Carb issues

Post  MrTweedy on Fri Sep 25, 2015 5:50 pm

Here's some photos of the carb, JH. Any use?
I can measure the carb if these don't help.

Matt



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carburettor

Post  piston 197 on Fri Sep 25, 2015 6:20 pm

It is an S25 carburettor,
set it up as follows
Adjust the centre screw in the throttle slide until you have 1.95" of needle protruding from the flat bottom of the throttle slide
Adjust the air screw fully in and then turn approx. 1 1/2 turns out
You may have to adjust slightly from these factory settings to compensate for wear.

This will give you the basics, it wont stop the carb flooding, this is caused by leakage of fuel after the float needle has closed, the float needle is square at the bottom and round at the top, there may be a burr on the shoulder where it changes from square to round if so remove this burr with a file, or the float needle or it's seating may be worn, if so new float needle and seat required, there are a few topics on here that deal with the removal of float needle seating, tapping it with a fine thread and removing with either a screw or slide hammer .
JH
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Thanks for the info.

Post  MrTweedy on Fri Sep 25, 2015 6:41 pm

Thanks JH, great info there. I'll get on to it and report back with results. The carb has just been refurbished so perhaps just a spot of tweaking is needed.

Kindest regards

Matt

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Re: Carb issues

Post  ScottT on Sat Sep 26, 2015 7:35 pm

Sorry to hijack this thread.

Piston, do you know the settings for a S19 carb as i'm having similar issues.
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S19 carb

Post  piston 197 on Sun Sep 27, 2015 5:59 am

The factory setting for the S19 is 2.015 protruding below the flat bottom of the throttle slide, air screw again 1 1/2 turns out from fully home, again these settings will need fine tuning for carb wear, main jet should be a 80 for 30C plover engine.
JH
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Re: Carb issues

Post  ScottT on Sun Sep 27, 2015 2:27 pm

Thank you.
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Re: Carb issues

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